| 摘要 |
<p>To suppress/avoid occurrence of knocking, preignition or the like without sacrificing acceleration performance even during a transient period such as a sudden acceleration period. ! This control device for a variable compression ratio internal combustion engine includes a variable compression ratio device changing an engine compression ratio, a target compression ratio is set with respect to an operation condition determined based on an engine load and engine speed, and the engine compression ratio is variably controlled toward the target compression ratio. A reference compression ratio calculation section 41 is provided for calculating a reference compression ratio under a reference operation condition (during a fully open condition). A compression ratio allowance width calculation section 42 is provided for calculating a compression ratio allowance width Deltaepsi from the reference compression ratio in a predetermined operation condition in consideration of the rate of change of the engine compression ratio so that a change in the engine compression ratio follows with respect to a change in the operation condition from the predetermined operating condition to the reference operation condition. A target compression ratio calculation section 44 is provided for calculating the target compression ratio in the predetermined operation condition so that the target compression ratio falls within the compression ratio allowable width Deltaepsi. ! (C)2012,JPO&INPIT</p> |
